Assessment of the cognitive domain psychomotor function through yes or no responses within 5 minutes to 30 trials; score range: 0 to 3.69. Performance variable: speed of performance; average of the log10 t transformed reaction time for correct responses. Reaction times longer than 5 seconds (log10 [5000]) were excluded as reflecting responses that were abnormally slow.

Assessment of the cognitive domain psychomotor function through yes or no responses within 5 minutes to 30 trials; score range: 0 to 3.69. Performance variable: speed of performance; average of the log10 t transformed reaction time for correct responses. Reaction times longer than 5 seconds (log10 [5000]) were excluded as reflecting responses that were abnormally slow.

Assessment of the cognitive domain psychomotor function through yes or no responses within 5 minutes to 30 trials; score range: 0 to 3.69. Performance variable: speed of performance; average of the log10 t transformed reaction time for correct responses. Reaction times longer than 5 seconds (log10 [5000]) were excluded as reflecting responses that were abnormally slow.

Assessment of the cognitive domain working memory through yes or no responses to 30 trials within 5 minutes; score range: 0 to 1.57. Performance variable: accuracy of performance; arcsine transformation of proportion correct responses.

Assessment of the cognitive domain working memory through yes or no responses to 30 trials within 5 minutes; score range: 0 to 1.57. Performance variable: accuracy of performance; arcsine transformation of proportion correct responses.

Assessment of the cognitive domain working memory through yes or no responses to 30 trials within 5 minutes; score range: 0 to 1.57. Performance variable: accuracy of performance; arcsine transformation of proportion correct responses.

Assessment of the cognitive domain visual attention through a yes or no response to 30 trials within 5 minutes; score range: 0 to 3.69. Performance variable: speed of performance; average log10 transformed reaction time for correct responses. Reaction times longer than 5 seconds ( log10 [5000]) were excluded as reflecting responses that were abnormally slow.

Assessment of the cognitive domain visual attention through a yes or no response to 30 trials within 5 minutes; score range: 0 to 3.69. Performance variable: speed of performance; average log10 transformed reaction time for correct responses. Reaction times longer than 5 seconds ( log10 [5000]) were excluded as reflecting responses that were abnormally slow.

Assessment of the cognitive domain visual attention through a yes or no response to 30 trials within 5 minutes; score range: 0 to 3.69. Performance variable: speed of performance; average log10 transformed reaction time for correct responses. Reaction times longer than 5 seconds ( log10 [5000]) were excluded as reflecting responses that were abnormally slow.

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Please refer to this study by its ClinicalTrials.gov identifier: NCT00744978